Page Comparison

let lineItems = []
let i = 0
/* To generate two empty rows */
while(i < 2) {
    lineItems.push({
        "weight": "",
        "unit": ""
      })
      i += 1
  }
/* Variant is the field name */
if(Array.isArray(lineItems)){
  this.changeFormValue("Variant", JSON.stringify(lineItems))
}